Hello @Lasitha851,
Theme Options > WooCommerce > Single Product Page Builder > change width of sections > https://prnt.sc/emdfSJaH9lWt Do not forget to edit or delete your custom template – https://prnt.sc/R8sVtxPUAJdy
Plugins can be installed via XStore > Plugins installer – https://prnt.sc/lufXTWOVN1tM or manually via Dashboard of FTP using archives from this page – https://www.8theme.com/downloads
If you are using Elementor, it is not recommended to activate WPBakery, because editing the same content using both plugins will cause a mess in the structure of the content.
Regards